有机相脱酸体系对不同老化墨迹的影响

目的 为了评价古籍化学品的综合效果,完善其除纸张性能外的墨迹的评价指标,探究不同有机相脱酸体系对老旧书页墨迹的影响.方法 制备胶印、中性笔墨样和书法用墨样,并对墨样进行人工老化处理.选择氢氧化钡的甲醇溶液(质量浓度为20 g/L)、氢氧化钡的二乙二醇溶液(质量浓度为17 g/L)和碳酸镁的甲醛溶液(质量浓度为10 g/L)分别对老旧书页以及人工老化的墨样进行脱酸处理.通过扫描仪高分辨率扫描墨样进行图像观察,用分光光度计测量墨样色密度,对3种有机相脱酸剂处理后的墨迹效果进行主客观评价.结果 主客观评价结果显示,经氢氧化钡的甲醇溶液处理后的墨样变化轻微;经碳酸镁的甲醛溶液处理后,墨样表面覆有1层碳酸镁颗粒,墨迹颜色明显变浅,墨样色密度显著降低;经氢氧化钡的二乙二醇溶液处理后,墨迹颜色变深,墨样色密度和线宽均有所增加.结论 不同脱酸体系会对老化墨样字迹产生不同程度影响,研究从图文信息质量的角度为古籍脱酸化学品的综合效果与评价提供一定的参考和借鉴.     

Performance Assessment of Nanocellulose Hydroxypropyl Methyl Cellulose Composite on Role of Nano-CaCO3 for the Preservation of Paper Documents

Deacidification and self-cleaning are important for the preservation of paper documents. In this study, nano-CaCO₃ was used as a deacidification agent and stabilized by nanocellulose (CNC) and hydroxypropyl methylcellulose (HPMC) to form a uniform dispersion. Followed by polydimethylsiloxane (PDMS) treatment and chemical vapor deposition (CVD) of methyltrimethoxysilane (MTMS), a hydrophobic coating was constructed for self-cleaning purposes. The pH value of the treated paper was approximately 8.20, and the static contact angle was as high as 152.29°. Compared to the untreated paper, the tensile strength of the treated paper increased by 12.6%. This treatment method endows the paper with a good deacidification effect and self-cleaning property, which are beneficial for its long-term preservation.